Unlike a phonograph record that has a constant angular speed, a cd scans information at a constant linear?
r speed (130 cm/s).
does the cd rotate at a constant or varying
angular speed?
1. varying angular speed.
2. constant angular speed.

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.